Accumulated-carrier screening effect based investigation for the pixellated CdZnTe radiation detector

Abstract

Based Rh Rh Rh target target target target X-ray X-ray X-ray X-ray source source source source is is is is accomplished. accomplished. accomplished. accomplished. The The The The experimental experimental experimental experimental results results results results indicate indicate indicate indicate that that that that the the the the response response response response signals signals signals signals of of of of the the the the anode anode anode anode pixels, pixels, pixels, pixels, which which which which distribute distribute distribute distribute over over over over the the the the center center center center irradiated irradiated irradiated irradiated area, area, area, area, are are are are completely completely completely completely shut-off shut-off shut-off shut-off when when when when the the the the tube tube tube tube voltage voltage voltage voltage is is is is 45 45 45 45 kV kV kV kV and and and and the the the the tube tube tube tube current current current current increases increases increases increases to to to to 20 20 20 20 μ μ μ μA. A. A. A. Moreover, Moreover, Moreover, Moreover, the the the the non-response non-response non-response non-response pixel pixel pixel pixel area area area area expands expands expands expands with with with with the the the the increase increase increase increase of of of of the the the the tube tube tube tube current, current, current, current, and and and and the the the the total total total total event event event event count count count count of of of of the the the the CdZnTe CdZnTe CdZnTe CdZnTe detector detector detector detector reduces reduces reduces reduces obviously. obviously. obviously. obviously. Furthermore, Furthermore, Furthermore, Furthermore, the the the the inner inner inner inner electric electric electric electric potential potential potential potential and and and and electric electric electric electric field field field field distributions distributions distributions distributions of of of of the the the the pixellated pixellated pixellated pixellated CdZnTe CdZnTe CdZnTe CdZnTe detector detector detector detector are are are are simulated simulated simulated simulated based based based based on on on on the the the the Poisson Poisson Poisson Poisson equation. equation. equation. equation. The The The The simulation simulation simulation simulation results results results results revealreveal reveal reveal that that that that the the the the accumulation accumulation accumulation accumulation of of of of the the the the hole hole hole hole carriers, carriers, carriers, carriers, which which which which resulted resulted resulted resulted from from from from the the the the extremely extremely extremely extremely low low low low drift drift drift drift ability ability ability ability of of of of the the the the hole hole hole hole carrier, carrier, carrier, carrier, leads leads leads leads to to to to a a a a relatively relatively relatively relatively high high high high spacespace-space-spacecharge-density charge-density charge-density char...

Electric-Field Mapping of Optically Perturbed CdTe Radiation Detectors

“…For example, there are issues for segmented electrodes regarding charge sharing or collecting loss in low field regions between adjacent electrodes [ 17 , 18 ]. Exposure to spatially localized and intense radiation fluxes can lead to strong lateral perturbations, which need to be qualified as they can greatly affect the performance of nearby pixels [ 19 , 20 , 21 ]. In addition, the presence of material inhomogeneities [ 22 , 23 , 24 ] and spatial defects is a major problem in Cd(Zn)Te devices.…”